Sender Policy Framework
A DNS policy authorising sending sources for the envelope-sender domain. It neither signs content nor alone authenticates the visible From field.
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Glossary
Technology, explained clearly. Find a term, choose a letter or narrow the topic. Definitions include sources and their review date.
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Clear filtersSMTP TLS reporting
A mechanism reporting secure-email-transport problems. It supports policy monitoring but does not itself enforce encryption or delivery.
Definition and sourcesSSL and TLS
A historical family of secure-transport protocols superseded by TLS. SSL certificate remains colloquial terminology; obsolete SSL versions should not be enabled.
Definition and sources